KIT and neoplasm: Genotyping revealed that 15 tumours had KIT mutations (14 in exon 11 and one in exon 9), 11 tumours had PDGFRA mutations (9 in exon 18 and two in exon 12), and 3 were KIT/PDGFRA wild-type GISTs within the analyzed mutation hotspots (Table 1).